Posted here is a screenshot of my eidolon, but the numbers are all over the place on other characters. I'm not sure what terminology to use to describe it is because I have no idea of the purpose. Is this a stat for additional attacks/rd. or just the bonuses you use for hasted attacks after the first full attack? I apologise for my ignorance in advance but I'm curious about this.

1 Answer
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Those are the attack bonuses for iterative attacks in a full attack action for this creature with that weapon. This creature gets three attacks in a full attack, at +20, +20, and +15, each of which deal out 3d6+27+1d6 acid damage. It includes whatever buffs you have activated in Hero Lab - so if you have Haste on in the Adjust tab, then there's an extra attack for Haste in that line - or not, if not.

Here's the witch I was playing today's weapon tab, showing the normal 2 attacks for a BAB above +5:

And then again with Haste applied:

This is just like in a creature's stat block. In fact, you could output the stat block of this creature in Hero Lab if you're unclear how things are mapping to each other (File... Output Hero Statblock...).